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Finding the Fourth Proportional to 831,615.60, 1,247,423.40 and 820,556.40

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Solution

The fourth proportional to 831,615.60, 1,247,423.40 and 820,556.40 is: 1,230,834.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    831,615.60 : 1,247,423.40 = 820,556.40 : x
  2. Step 2: Convert to fraction form
    831,615.60/1,247,423.40 = 820,556.40/x
  3. Step 3: Cross multiply
    831,615.60x = 1,247,423.40 × 820,556.40
  4. Step 4: Simplify right side
    831,615.60x = 1,023,581,254,379.76
  5. Step 5: Solve for x
    x = 1,023,581,254,379.76/831,615.60
  6. Step 6: Final answer
    x = 1,230,834.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.